There is no such thing as a "no return" policy on
ebay, just the same as there is no such thing as "buyer responsible for insurance." (If the item never arrives or arrives damaged, it's always 100% seller responsibility. Insurance protects the seller, not the buyer.)
If you file a SNAD (Significantly Not As Described) dispute with Paypal and
ebay, you will be refunded. You are then asked to return the item to the seller.
However, whether you return it or not, you are still refunded.
Buyers have used this to scam sellers in the past by filing fake SNADs and returning literal garbage, scoring both the item + a refund.
As long as you follow the policies, and pay with Paypal, you have very good protection against scam sellers; however, if you don't follow the process (timely filing of an INR or SNAD) you may be in trouble.
Incidentally, this applies no matter what the seller states in his listing. They can say "no returns" all they want, but the return policy is set by Paypal and by
ebay, not by the seller.
(FYI: Always use a CREDIT CARD as your Paypal funding source. In the event that Paypal does not refund you, you can file fraud with your credit card company, who will reverse the charges.)
As to the Registry, currently, if you attempt to add a serial number that is already "owned", it will pop up a window stating that the SN is already part of a collection and give you the offer to e-mail the collection owner to mark the coin as "sold" allowing you to add it to your set(s.)
Finally,
ebay sellers are required to list the certification # in the listing when selling PCGS, ANACS or NGC slabbed coins. Failure to do so is a violation of the Listing Policy and may result in seller strikes leading up to a NARU ban hammer. Any
ebay seller who is not listing the slab certification # and/or using stock photos on rare coins is one to be avoided at all costs. I'll make an exception for
APMEX but at least you know up front you're getting a random slabbed coin in the specified grade, not a PARTICULAR coin.
My guess would be either 1) this particular seller is using fake slabs or 2) this particular seller has a bunch of problematic (overgraded, low EA or ugly) slabbed coins that they want to get rid of but that would never sell as-is, so they're using stock photos to sell the uglies.
Member
ANA - EAC - TNA - SSDC - CCT #890
"Most of the things worth doing in the world had been declared impossible before they were done." -- Louis D. Brandeis